* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Segoe UI", Roboto, sans-serif;
    background-color: #0f172a;
    color: #e5e7eb;
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: auto;
    padding: 80px 0;
}

nav {
    background: #111827;
    border-bottom: 1px solid #1f2937;
}

nav .nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

nav a {
    color: #e5e7eb;
    text-decoration: none;
    margin-left: 30px;
    font-weight: 500;
    font-size: 14px;
    letter-spacing: 0.5px;
}

nav a:hover {
    color: #2563eb;
}

.hero {
    background: linear-gradient(to right, #0f172a, #1e293b);
    padding: 140px 0;
}

.hero h1 {
    font-size: 52px;
    font-weight: 700;
    margin-bottom: 20px;
}

.hero p {
    font-size: 20px;
    max-width: 700px;
    color: #9ca3af;
}

.btn {
    display: inline-block;
    margin-top: 30px;
    padding: 14px 32px;
    background: #2563eb;
    color: white;
    text-decoration: none;
    font-weight: 600;
}

.btn:hover {
    background: #1d4ed8;
}

.section-dark {
    background: #111827;
}

.section-light {
    background: #1f2937;
}

h2 {
    font-size: 32px;
    margin-bottom: 30px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.card {
    border: 1px solid #374151;
    padding: 30px;
    background: #111827;
}

.card h3 {
    margin-bottom: 15px;
    color: #2563eb;
}

footer {
    background: #111827;
    text-align: center;
    padding: 40px 0;
    border-top: 1px solid #1f2937;
    font-size: 14px;
    color: #6b7280;
}